The obvious and almost certainly correct answer to the meta-question is that there is no question that can be asked that won't cause the AI to devote as many possible resources to answering forever, given that activating it doesn't cause it to ask itself the simplest possible question and then spend eternity answering it over and over without ever interacting non-harmfully with humans.
The Future of Humanity Institute wants to pick the brains of the less wrongers :-)
Do you have suggestions for safe questions to ask an Oracle? Interpret the question as narrowly or broadly as you want; new or unusual ideas especially welcome.